基于静磁场诱导取向的石墨烯四氧化三铁/硅橡胶电磁屏蔽复合材料的制备与研究,Polymer Composites

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基于静磁场诱导取向的石墨烯四氧化三铁/硅橡胶电磁屏蔽复合材料的制备与研究
Polymer Composites ( IF 4.8 ) Pub Date : 2024-02-15 , DOI: 10.1002/pc.28220
Jiaxing Guo ₁ , Qin Zhou ₁ , Jikai Xie ₁ , Hong Yin ₂ , Zhi Hao ₁ , Zhu Luo ₁ , Le Yang ₃ , Cheng Zhang ₁

Affiliation

采用静态磁场诱导排列制备了含有高负载石墨烯负载 Fe ₃ O ₄ (Fe ₃ O ₄ @RGO) 颗粒的石墨烯负载四氧化三铁/硅橡胶复合材料。 Fe ₃ O ₄ @RGO 颗粒通过傅里叶变换红外、X 射线衍射、SEM 和 XPS 分析进行表征。随后，通过扫描电镜和拉曼光谱的协同组合，研究了添加材料和磁场强度对填料排列分布的影响。评估了复合材料的导电性和电磁屏蔽性能。复合材料的电导率随着填料添加量的增加而增加，25 wt%填料混合物的固化速率最快，扭矩最大，填料添加量的持续增加导致许多缺陷的出现。同时，随着磁场强度的增加，填料的排列分布逐渐增强。在 180 mT 下合成的复合材料表现出最显着的排列，有助于建立有效的导电路径。这使得电磁屏蔽效能显着增强，比纯硅橡胶高约 400%，比非排列复合材料高约 40%。这种方法引入了一种塑造柔性电磁屏蔽材料结构设计的新概念。

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Fabrication and investigation of graphene-loaded triiron tetraoxide/silicone-rubber electromagnetic shielding composites based on static magnetic-field–induced orientation

Graphene-loaded triiron tetraoxide/silicone-rubber composites containing highly loaded graphene-loaded Fe₃O₄ (Fe₃O₄@RGO) particles were fabricated using static magnetic field-induced alignment. The Fe₃O₄@RGO particles were characterized through Fourier transform infrared, x-ray diffraction, SEM, and XPS analyses. Subsequently, the influence of added material and the strength of the magnetic field on the alignment distribution of the filler were examined through a synergistic combination of SEM and Raman spectroscopy. The electrical conductivity and electromagnetic shielding properties of the composites were assessed. The electrical conductivity of the composites increased with increasing filler addition, the 25 wt% filler mixture had the fastest curing rate and the maximum torque, and the continued increase in filler addition led to the occurrence of many defects. Concurrently, the alignment distribution of the filler progressively enhances with the augmentation of magnetic field strength. The composites synthesized at 180 mT exhibit the most substantial alignment, facilitating the establishment of effective conductive pathways. This results in a notable enhancement in electromagnetic shielding effectiveness, approximately 400% greater than that of pure silicone rubber and around 40% higher than that of non-aligned composites. This approach introduces a novel concept for shaping the structural design of flexible electromagnetic shielding materials.

更新日期：2024-02-15

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